Physics 2020 Past Questions | JAMB

Study the following Physics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

31. Two divers G and H are at depths 20m and 40m, respectively below the water surface in a lake. The pressure on G is O1while the pressure on H is P2, If the atmospheric pressure is equivalent to 10m of water, then the value of P2/P1is

• A. 0.50
• B. 0.60
• C. 1.67
• D. 2.00

32.

The figure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40oo, then the value of W is

• A. 28.0N
• B. 48.0N
• C. 288.0N
• D. 50.0N

33.

In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80oC is known as the

• A. cooling temperature
• B. boiling point
• C. melting point
• D. vaporization point

34. In the figure, the value of R is

• A. 3Ω
• B. 6Ω
• C. 4Ω
• D. 5Ω

35.  Which of the following instruments consumes the highest current?

 I. Electric ironII. Television setIII. Torch lightIV. Immersion heater 250v220v6v110v 1kW110W30W500W

• A. I
• B. II
• C. III
• D. IV

36.

In which of the following diagrams is the length of the tube equal to one wavelength?

• A. a
• B. b
• C. c
• D. d

37. A hydrometer is an instrument for measuring the

• A. a depth of water of water in a vessel
• B. relative density of a liquid by the method of flotation
• C. relative density of a liquid by finding the apparent loss in weight
• D. relative humidity of the air

38. A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

• A. 1600
• B. 1200
• C. 200
• D. 2400
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